Wood club head

Abstract

In a wood club head having a hollow metal shell structure with a double face constituted by a front face and a rear face which is disposed behind the front face through an air gap of predetermined width, there is provided a characteristic that when a golf ball is made to collide with the front face at an entrance speed (head speed) V (m/s), the restitution coefficient of the face is in a range of from 0.84 to 0.88 when the entrance speed V is in a range of from 35 to 40 (m/s), and not lower than 0.80 and lower than 0.83 when the entrance speed V is in a range of from 48 to 53 (m/s).

What is claimed is:  
     
       1. A wood club head comprising: 
       a head main body defining a hollow portion, the head main body including a front face forming a hitting face and a rear face disposed behind the front face so as to form a gap of a predetermined width between the front face and the rear face, the rear face having a thickness in a range of 1.5 mm to 2.3 mm,  
       wherein, when a golf ball is made to collide on the front face at an entrance speed V (m/s), a restitution coefficient of the front face is in a range of from 0.84 to 0.88 in a case where the entrance speed V is in a range of from 35 to 40 (m/s).  
     
     
       2. The wood club head according to  claim 1 , wherein the front face is thinner in thickness than the rear face, and the front face is not thinner than 1.3 mm but thinner than 2.0 mm. 
     
     
       3. The wood club head according to  claim 1 , wherein the front face and the rear face are made of titanium alloy, stainless steel or amorphous alloy. 
     
     
       4. The wood club head according to  claim 1 , wherein the gap has thickness in a range of 0.2 mm to 1.0 mm. 
     
     
       5. A wood club head comprising: 
       a head main body defining a hollow portion, the head main body including a front face forming a hitting face and a rear face disposed behind the front face so as to form a gap of a predetermined width, the rear face having a thickness in a range of 1.5 mm to 2.3 mm, wherein, when a golf ball is made to collide on the front face at an entrance speed V (m/s), a restitution coefficient of the front face is not lower than 0.80 but lower than 0.83 in a case where the entrance speed V is in a range of from 48 to 53 (m/s).  
     
     
       6. The wood club head according to  claim 5 , wherein the front face and the rear face are made of titanium alloy, stainless steel, or amorphous alloy. 
     
     
       7. The wood club head according to  claim 5 , wherein the gap has thickness in a 0.2 mm to 1.0 mm. 
     
     
       8. The wood club head according to  claim 5 , wherein the front face is thinner in thickness than the rear face, and the front face is not thinner than 1.3 mm but thinner than 2.0 mm.